The only diet that works - Celeb trainer explains.

For some supermodels, the only person worth asking about fitness and diet is trainer-to-the-stars, Justin Gebland.

Speaking to Daily Mail, Gebland claims that when it comes to getting his A-list clients - including Karlie Kloss, Irina Shayk, Erin Heatherton, and Candice Swanepoel - into shape it’s all about what you eat.

Also nicknamed the ‘caveman’ diet, the meal options are low-carb and high in fats. It eschews all processed food in favour of nutrient-dense fresh fruits and vegetables,meat, nuts and seeds. No grains, no beans, no dairy, no refined sugar.